The factory 24-valve M104 inline-six was modified by AMG, increasing displacement to 3.4 liters and features a larger bore and longer stroke. The underside of the engine block is AMG stamped with matching AMG engine stickers on the valve cover and radiator support. Power to the rear wheels through a four-speed automatic transmission. The transmission was serviced and flushed in 2023. Additional service includes refurbishment of the fuel distributor, adjusting the exhaust system and throttle-linkage assembly, and replacing vacuum hoses and an oxygen sensor along with the intake manifold gasket, fuel injector seals, air-flow meter potentiometer, idle air control valve, and associated hoses. Invoices total approximately $20k and are provided in the gallery. Underbody photos are provided in the gallery. 

The data tag decodes as follows:

• 240 – Outside temperature indicator
• 271 – Black leather upholstery
• 291 – Airbag for front passenger
• 412 – Electric sliding roof with tilting device
• 443 – Tempomat (cruise control), and electrically-adjustable steering column
• 471 – Acceleration Skid Control (ASR)
• 531 – Automatic antenna
• 586 – Behr air conditioner, and electric windows front and rear
• 600 – Headlamp wiper/washer
• 620 – Emission control system
• 744 – Brilliant Silver Metallic paint
• 752 – Becker radio Mexico 2000 VK
• 814 – Active bass loudspeaker system
• 869 – No code designation available
• 990 – AMG version

Videos below provide a cold start, walk around, and driving footage of the 3.4L wagon.